Maetijf jubwan



' UNITED STATES PATENT OFFICE.

MARTIN KIEWAN, or SYRACUSE, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent N0. .367 ,983, dated August9, 1887.

ApplioationfiledSeptember 15, 1886. Serial No. 213,622. (No model.)

To all whom it may concern:

Be it known that I, MARTIN KIRWAN, a citizen of the United States,residing at Syracuse, in the county of Onondaga and State of New York,have invented a new and useful Improvement in steam Boilers, of whichthe following is a specification.

My invention relates to improvements in steam-boilers; and itconsists ofthe peculiar combination and novel construction and arrangement of thevarious parts for service, substantially as hereinafter fully described,and particularly pointed out in the claim.

The primary objeet of my invention is to provide an. improvedsteam-boiler of simple and durable construction with means whereby amore extended surface for the heat and products of combustion isprovided, and through which the water is caused to circulate incomparatively thin sheets, so that a greater amount of steam isgenerated with the same quantity of fuel than has heretofore beenpossible with boilers of ordinary construction, thereby effecting a verymaterial saving in the'cost of running the boiler. I f

In the accompanying drawings, which illustrate a steam-boilerembodyingmy invention, Figurel is an end view of my improved boiler removed fromthe masonry which surrounds the firebox. Fig. 2 is a verticallongitudinal sectional view thereof on the line 90 m of Fig. 1; and Fig.3 is a vertical transverse sectional view on the'line l g of Fig. 2.

Referring -to the drawings, in which like letters of reference denotecorresponding parts in all the figures, A designates the cylindricalinelosing-shell of my improved boiler, which has the heads a at its endspermanently secured in place by rivets or in any other preferred manner.These heads of the cylindrical outer shell are provided with a series ofopenings, at, and the heads are connected by a series of flues, B, whichconnect with aligned openings a in opposite heads a of the cylindricalshell. These flues B are ofany approved pattern and secured in place inthe heads a in any desired or preferred manner, so that the heat andproducts of combustion will pass through the fines without entering theinterior main chamber of the cylindrical inclosing-shell. The tubes orflues Bserve as stays to the heads a of the outer shell, A, and therebybrace and strengthen theapparatus.

The heads a of the outer cylindrical shell of the boiler are provided attheir middle with enlarged openings a around which are arranged theopenings a and the lines B, and these openings are made square or of anyother preferred form or shape, it only being necessary that the sides ofthe opening shall .be arranged at an angle to each other, for a purposeto be describedhereinafter.

O designates an inner shell, which is inclosed or housed within theouter cylindrical shell. This inner shell is made square or of any otherdesired form in cross-section to correspond with the shape of theopenings a in the heads a of the outer cylindrical shell, and at itsends against the heads a of the shell A around the openings a in saidheads, and are secured thereto by rivets 0, thus detachably securing theinner shell to the heads of the outer shell and thereby permitting theinner shell to be detached for the purpose of permitting ready access tothe water tubes and chamber to repair and clean the same, as will bevery readily understood. The inner square shell, 0,istaperedlongitudinally, as shown in Fig. 2 of the drawings, so that oneend is wider than the opposite end for the purpose of facilitating theadjustment of the inner shell within the outer cylindrical shell or theremoval of the inner from the outer shell.

The inner removable shell has a series of transverse water-tubes, E F,secured therein, and which open through the sides of the inner shell andinto the main chamber of the cylindrical outer shell in which the wateris retained.

The series of water-tubes E are arranged at right angles to the seriesof tubes F, and said series of tubes E alternate with the series F, andthese tubes'run in their proper directions throughout the entire lengthof the angular inner shell.

The ends of the angular inner shell are left open, so that the heat andother products of combustion will pass freely through the inner shell,and thus act upon and heat the inner shell and water-tubes E F therein,and by this peculiar arrangement of the inner shell and tubes therein anincreased area of heating-surface is provided for the heat to act uponthe water.

The inner chamber of the outershell contains the water to be heated,which flows through and fills the water-tubes E F ofthe inner shell, andthe water is divided up into thin sheets or bodies by the tubes or linesB, the inner shell, (3, and the transverse tubes E F, so that the wateris more rapidly converted into steam with the same quantity of fuel thanhas been heretofore possible with the ordinary form of boilers and at amuch less cost.

It will be seen that I provide a very large heating surface, againstwhich the heat and products of combustion impinge before finally passingout of the boiler-nan1ely, the inner shell, (3, the tubes or flues Bwithin the outer shell and around the inner shell, and the transversetubes within the inner shell communieating with the chamber of the outercylind rical shell.

The operation of my invention will be readily understood from theforegoing description, taken in connection with the drawings.

My improved boiler is very simple and durable in construction and cheapand inexpensive of manufacture.

Ready access to the interior parts of the boiler can be had within avery short time to clean and repair the same, which is very important inan apparatus 01 this class. The outer cylindrical shell has a steamdrum, G,

011 its upper side, as is usual, and which is of any approved pattern.

I have not deemed it necessary in this specification to show anddescribe the relative arrangement and disposition of the fire-box with.relation to the boiler, as such matter will be readily understood andsupplied by a person skilled in the art to which my invention relates.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

In a steanrboiler, the combination of the outer shell having the headsprovided with aligned central openings, one of which is larger than theother, the inner shell, 0, arranged in the outer shell and extendinglongitudinally through the same, the said inner shell being taperedthroughout its length and having its ends turned out at right angles toform llanges c, which flanges are riveted to the outer sides of theboiler-heads, the series of water-tubes E and F,extending transverselythrough the inner shell and arranged at right angles to each other,andthe series of lines D, extending through the boiler and surrounding theinner shell, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

MARTIN K i it WAN.

XVi t n esses Josern BONDY, Tnoniis BUN'rLon.

